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System I/O address specifications

I/O address (hex) System function (shipping configuration)

000 - 00F DMA controller no. 1

010 - 01F Unused

020 - 021 Interrupt controller no. 1

022 - 024 Opti chipset configuration registers

025 - 03F Unused

02E - 02F 87334 “Super I/O” configuration for CPU

040 - 05F Counter/timer registers

044 - 05F Unused

060 Keyboard controller

061 Port B

062 - 063 Unused

064 Keyboard controller

065 - 06F Unused

070 - 071 NMI enable/RTC

072 - 07F Unused

080 - 08F DMA page registers

090 - 091 Unused

092 Port A

093 - 09F Unused

0A0 - 0A1 Interrupt controller no. 2

I/O Address (hex) System Function (shipping configuration)

0A2 - 0BF Unused

0C0 - 0DF DMA controller no. 2

0E0 - 0EF Unused

0F0 - 0F1 Coprocessor busy clear/reset

0F2 - 0FF Unused

100 - 16F Unused

170 - 177 Secondary fixed disk controller

178 - 1EF Unused

1F0 - 1F7 Primary fixed disk controller

1F8 - 200 Unused

201 JoyStick (decoded in ESS1688)

202 - 21F Unused

112 Chapter 6 Specifications

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HP 6710b - Compaq Business Notebook Specifications

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